> This license statement forbits commercial use and thus is a> proprietory software license incompatible with the GNU GPL.

> - Reimplement it as Free Software.

I've implemented a similar functionality in python under GNU LGPL.
The result is attached.

It can almost do everything that msg2archive could do.
Together with "formail" it also replaces mailbox2archive for me.
(e.g. like cat hypermail-test.9907 | formail -s msg2hypermailarchive.py --month 7 --year 1999 -L hypermail-test -v )